The driver of the truck that struck and killed visiting MIT scientist Kanako Miura as she rode her bicycle near Kenmore Square on Sunday has been identified, said two law enforcement officials. He is cooperating with investigators, one of the officials said.

Miura was riding near the intersection of Beacon Street and Charlesgate West at about 3:30 p.m. when she was hit by a truck and sustained massive injuries. Miura, 36, had been working at the Massachusetts Institute of Technology since the fall of 2012 in the university’s Computer Science and Artificial Intelligence Laboratory.

Miura was a native of Japan, according to the Cambridge school.

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The driver, whose name has not been released, has not been charged yet, the officials said.

He was questioned on Sunday. Officials said it was not immediately clear if the driver knew he had struck anyone as he drove through the busy Kenmore Square area.

Soon after the accident, Boston police spoke to eyewitnesses who said the vehicle was as large as a garbage truck, one of the officials said. The driver was stopped by police a short distance from the crash. Both officials spoke on condition of anonymity because they are not authorized to speak to the media.

The size and weight of the truck would have made it possible for the driver to hit Miura without realizing it, the officials said.

The death came just four days after Mayor Thomas M. Menino made a pledge to cut the cyclist crash injury rate in Boston.